New CTI Correction Method for the Spaced-Row Charge Injection of the Suzaku X-Ray Imaging Spectrometer

Kavli Affiliate: Gregory Prigozhin

| First 5 Authors: Hideki Uchiyama, Midori Ozawa, Hironori Matsumoto, Takeshi Go Tsuru, Katsuji Koyama

| Summary:

The charge transfer inefficiency (CTI) of the X-ray CCDs on board the Suzaku
satellite (X-ray Imaging Spectrometers; XIS) has increased since the launch due
to radiation damage, and the energy resolution has been degraded. To improve
the CTI, we have applied a spaced-row charge injection (SCI) technique to the
XIS in orbit; by injecting charges into CCD rows periodically, the CTI is
actively decreased. The CTI in the SCI mode depends on the distance between a
signal charge and a preceding injected row, and the pulse height shows periodic
positional variations. Using in-flight data of onboard calibration sources and
of the strong iron line from the Perseus cluster of galaxies, we studied the
variation in detail. We developed a new method to correct the variation. By
applying the new method, the energy resolution (FWHM) at 5.9 keV at March 2008
is ~155 eV for the front-illuminated CCDs and ~175 eV for the back-illuminated

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